Abstract:

ZSM-5 zeolite is a solid acid catalyst with open pore structure, and the structure-activity relationship between its structure and catalytic performance has become a research hotspot in this field. Herein, this review provides a comprehensive overview of the recent advancements in the structural regulation of ZSM-5 zeolite (framework aluminum distribution, pore structure, and framework defects). The diversity distribution of framework aluminum atoms and its characterization techniques are introduced, and the impacts of framework aluminum atoms distributions on the catalytic performances of ZSM-5 zeolite are described. In addition, the pore structure regulation strategies of ZSM-5 zeolite are summarized, and the effects of pore size and diffusion path length on the adsorption/diffusion of guest molecules, shape selectivity and catalysis are discussed. Modulation strategies of ZSM-5 zeolite framework defects are also summarized and the corresponding impacts on the acidity, hydrophilicity/hydrophobicity, and capability of coke tolerance of zeolite are elucidated. Finally, a perspective on future research was proposed. i.e. precise characterization of aluminum distribution, establishment of the relationship between aluminum distribution and catalytic performance, preparation of specific structured zeolites based on a profound understanding of the synthesis mechanism, and controllable modulation of defects according to reaction requirements are important directions in the future researches of ZSM-5 zeolite.

Key words: ZSM-5 zeolite, aluminum distribution, pore structure, silanol, catalysis

摘要：

ZSM-5分子筛作为一种具有开放孔结构的固体酸催化剂，其结构与催化性能之间构效关系的建立一直是该领域的研究热点。基于此，本文系统总结了近年来关于ZSM-5分子筛结构（骨架铝分布、孔道结构及骨架缺陷）调控合成的研究进展。本文介绍了骨架铝原子的多样性分布及其表征技术，探讨了铝分布对催化性能的影响；归纳了ZSM-5分子筛孔道结构调变的手段，讨论了孔道尺寸、孔程长短对客体分子的吸附扩散、择形和催化的影响；总结了骨架缺陷的调控策略，并探讨了骨架缺陷对分子筛的酸性、亲疏水性及抗积炭性的影响。最后，对未来研究方向进行了展望，指出铝分布的精准表征、铝分布与催化性能构效关系的建立、结合对合成机理的深刻认识制备特定结构的分子筛及根据反应需求可控调节缺陷是未来ZSM-5分子筛研究领域的重要方向。

关键词: ZSM-5分子筛, 铝分布, 孔道结构, 硅羟基, 催化